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RTV is great for sealing vacuum hard lines to rubber lines. it adds peace of mind when lines have the ability to vibrate and wiggle from their female counterparts.
I used black RTV to seal up a 20" bike rim where the spokes poke through and installed a small valve stem to make a tubeless bike tire. It's great when you ride BMX and constantly pinch/blow out tubes.
The worst use is when a shade-tree mechanic rebuilds an engine using way too much RTV, and 6 months later the oil pump pickup screen is PLUGGED with bits of silicone. This results in loss of oil pressure, and ultimately spun rod bearings. Thankfully the crank bearings were OK and the block was saved.
PS: I took the motor apart after the fact, im not the one that rebuilt it.
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